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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d0c64213ca8c743a57dc2ca0ad7411876393fea786ccc3ce0db44361d9c445a' 
  AND token = '7yxSMlAUnr6TSAvAXyVSqM7wfItNTZtzi+MwpoL9JYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}